/************************************************************************************************************
Ajax dynamic content
Copyright (C) 2006  DTHMLGoodies.com, Alf Magne Kalleland

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

Dhtmlgoodies.com., hereby disclaims all copyright interest in this script
written by Alf Magne Kalleland.

Alf Magne Kalleland, 2006
Owner of DHTMLgoodies.com


************************************************************************************************************/    

var enableCache = true;
var jsCache = new Array();

var dynamicContent_ajaxObjects = new Array();

function ajax_showContent(divId,ajaxIndex,url,callbackOnComplete)
{
    var targetObj = document.getElementById(divId);
    targetObj.innerHTML = dynamicContent_ajaxObjects[ajaxIndex].response;
    if(enableCache){
        jsCache[url] =     dynamicContent_ajaxObjects[ajaxIndex].response;
    }
    dynamicContent_ajaxObjects[ajaxIndex] = false;
    
    ajax_parseJs(targetObj);
    
    if(callbackOnComplete) {
        executeCallback(callbackOnComplete);
    }
}

function executeCallback(callbackString) {
    if(callbackString.indexOf('(')==-1) {
        callbackString = callbackString + '()';
    }
    try{
        eval(callbackString);
    }catch(e){

    }
    
    
}

function ajax_loadContent(divId,url,callbackOnComplete)
{
    if(enableCache && jsCache[url]){
        document.getElementById(divId).innerHTML = jsCache[url];
        ajax_parseJs(document.getElementById(divId))
        evaluateCss(document.getElementById(divId))
        if(callbackOnComplete) {
            executeCallback(callbackOnComplete);
        }        
        return;
    }
    
    var ajaxIndex = dynamicContent_ajaxObjects.length;
    document.getElementById(divId).innerHTML = 'Loading content - please wait';
    dynamicContent_ajaxObjects[ajaxIndex] = new sack();
    
    if(url.indexOf('?')>=0){
        dynamicContent_ajaxObjects[ajaxIndex].method='GET';
        var string = url.substring(url.indexOf('?'));
        url = url.replace(string,'');
        string = string.replace('?','');
        var items = string.split(/&/g);
        for(var no=0;no<items.length;no++){
            var tokens = items[no].split('=');
            if(tokens.length==2){
                dynamicContent_ajaxObjects[ajaxIndex].setVar(tokens[0],tokens[1]);
            }    
        }    
        url = url.replace(string,'');
    }

    
    dynamicContent_ajaxObjects[ajaxIndex].requestFile = url;    // Specifying which file to get
    dynamicContent_ajaxObjects[ajaxIndex].onCompletion = function(){ ajax_showContent(divId,ajaxIndex,url,callbackOnComplete); };    // Specify function that will be executed after file has been found
    dynamicContent_ajaxObjects[ajaxIndex].runAJAX();        // Execute AJAX function    
    
    
}

function ajax_parseJs(obj)
{
    var scriptTags = obj.getElementsByTagName('SCRIPT');
    var string = '';
    var jsCode = '';
    for(var no=0;no<scriptTags.length;no++){    
        if(scriptTags[no].src){
            var head = document.getElementsByTagName("head")[0];
            var scriptObj = document.createElement("script");
    
            scriptObj.setAttribute("type", "text/javascript");
            scriptObj.setAttribute("src", scriptTags[no].src);      
        }else{
            if(navigator.userAgent.toLowerCase().indexOf('opera')>=0){
                jsCode = jsCode + scriptTags[no].text + '\n';
            }
            else
                jsCode = jsCode + scriptTags[no].innerHTML;    
        }
        
    }

    if(jsCode)ajax_installScript(jsCode);
}


function ajax_installScript(script)
{        
    if (!script)
        return;        
    if (window.execScript){            
        window.execScript(script)
    }else if(window.jQuery && jQuery.browser.safari){ // safari detection in jQuery
        window.setTimeout(script,0);
    }else{            
        window.setTimeout( script, 0 );
    } 
}    
    
    
function evaluateCss(obj)
{
    var cssTags = obj.getElementsByTagName('STYLE');
    var head = document.getElementsByTagName('HEAD')[0];
    for(var no=0;no<cssTags.length;no++){
        head.appendChild(cssTags[no]);
    }    
}